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  <a name="EN-US_TOPIC_0000002199963545"></a><a name="EN-US_TOPIC_0000002199963545"></a>
  <h1 class="topictitle1">A Snapshot-based Full Backup Job at the Storage Layer Fails, Indicating that LUN Snapshots Fail to Be Created</h1>
  <div>
   <div class="section">
    <h4 class="sectiontitle">Symptom</h4>
    <p>An Oracle snapshot-based full backup job at the storage layer fails, with an error message displayed indicating that LUN snapshots fail to be created, and the error details contain the LUN ID.</p>
   </div>
   <div class="section">
    <h4 class="sectiontitle">Possible Causes</h4>
    <p>According to the error details, the number of protection groups to which the to-be-backed-up LUN has been added reaches the upper limit (a LUN can be added to a maximum of eight protection groups).</p>
   </div>
   <div class="section">
    <h4 class="sectiontitle">Troubleshooting</h4>
    <ol>
     <li><span>Log in to DeviceManager of the OceanStor Dorado storage system in the production environment.</span></li>
     <li id="EN-US_TOPIC_0000002199963545__li10949142772018"><a name="EN-US_TOPIC_0000002199963545__li10949142772018"></a><a name="li10949142772018"></a><span>In the navigation bar, choose <span class="uicontrol"><b>Services &gt; Block Service &gt; LUN Groups</b></span>. Switch to the <span class="uicontrol"><b>LUNs</b></span> tab page and locate the LUN corresponding to the ID in the error details.</span><p></p>
      <div class="note">
       <img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span>
       <div class="notebody">
        <p>If the error details contain multiple LUN IDs, perform the following steps for the LUN corresponding to each ID.</p>
       </div>
      </div> <p></p></li>
     <li><span>Click the LUN name to go to the LUN details page.</span></li>
     <li id="EN-US_TOPIC_0000002199963545__li04441340134110"><a name="EN-US_TOPIC_0000002199963545__li04441340134110"></a><a name="li04441340134110"></a><span>Switch to the <strong>Protection</strong> tab page and select <span class="uicontrol"><b>Snapshot</b></span>. On the snapshot details page that is displayed, obtain the value of <span class="uicontrol"><b>Owning Snapshot CG</b></span>.</span></li>
     <li id="EN-US_TOPIC_0000002199963545__li11378225134717"><a name="EN-US_TOPIC_0000002199963545__li11378225134717"></a><a name="li11378225134717"></a><span>In the navigation bar, choose <span class="uicontrol"><b>Data Protection &gt; Protection Entities &gt; Protection Groups</b></span>. Switch to the <span class="uicontrol"><b>Snapshot CGs</b></span> tab page and locate the value of <span class="uicontrol"><b>PG</b></span> corresponding to <span class="uicontrol"><b>Owning Snapshot CG</b></span> obtained in <a href="#EN-US_TOPIC_0000002199963545__li04441340134110">4</a>.</span></li>
     <li><span>Switch to the <span class="uicontrol"><b>Protection Groups</b></span> tab page, locate the <span class="uicontrol"><b>PG</b></span> obtained in <a href="#EN-US_TOPIC_0000002199963545__li11378225134717">5</a>, and click its name. Switch to the <span class="uicontrol"><b>Members</b></span> tab page and select the LUN name obtained in <a href="#EN-US_TOPIC_0000002199963545__li10949142772018">2</a>.</span><p></p>
      <div class="note">
       <img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span>
       <div class="notebody">
        <p>Ensure that the selected LUN can be removed from the protection group. If the prefix of a protection group name is <strong>protect_group</strong>, the protection group may be automatically created by a backup job. Contact technical support engineers to check whether the protection group can be removed.</p>
       </div>
      </div> <p></p></li>
     <li><span>Click <span class="uicontrol"><b>Remove</b></span>.</span></li>
    </ol>
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     <strong>Parent topic:</strong> <a href="en-us_topic_0000002164757014.html">FAQs</a>
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